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Sherman transmission

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Rick '50 8N

02-07-2000 15:26:25




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I have a '50 model 8N with a Sherman aux. transmission (either over or under, not both)installed. Is the Sherman engaged with the lever in the forward or rear position? The tractor moves along faster with the lever in the rear position. Is that lever position an overdrive engaged or an underdrive not engaged using the machines original tranny ratio?

Sorry for any confusion caused but don't know how better to describe it.

Thanks in advance for your input.

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use a crayon, Nolan

02-08-2000 11:55:25




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 Re: Sherman transmission in reply to Rick '50 8N, 02-07-2000 15:26:25  
Take your handy dandy crayon, and mark the top of the pto shaft out back, and the top of the crankshaft pulley up front.

Put the main transmission in neutral, and engage the pto. Have the auxiliary lever in the forward position.

Bump the starter to crank the engine over for a second. Leave the ignition off, you don't want to start the engine, just turn it over.

Examine the marks on the pto and the pulley. If the marks are not lined up with each other now, you are not in the 1:1 ratio. If they are lined up, this is the 1:1 ration. Repeat a few times just to make sure.

Now start the tractor with the auxiliary in the 1:1 position, and observe the pto rpm. Shift the auxiliary transmission to the other position and again observe the pto rpm. If it's spinning faster, it's a step up transmission, if it's spinning slower, it's a step down transmission.

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Crayon?

02-08-2000 20:39:04




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 Re: Re: Sherman transmission in reply to use a crayon, Nolan, 02-08-2000 11:55:25  
PTO speed is 545 RPM at 1500 engine RPM. With nearly a 3 to 1 reduction through the transmission, crayon marks ain't gonna line up.



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Nolan

02-09-2000 03:38:59




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 Re: Re: Re: Sherman transmission in reply to Crayon?, 02-08-2000 20:39:04  
Doh!

For some reason, I thought it was one to one when I wrote that.



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TimK

02-08-2000 07:57:34




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 Re: Sherman transmission in reply to Rick '50 8N, 02-07-2000 15:26:25  
You have to understand that there were different Sherman trans combinations. there were over / under with standard drive in the center shift lever position if you pull out on the handle, but some Shermans were just step up tranmissions which purportedly increased tractor speed by 60% in the same rpm. If you can't pull the handle outward to get the standard drive, you probably have only the step up trans, with the slow speed being the tractor's "normal" gearing.

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jerry.in.ga

02-07-2000 19:25:13




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 Re: Sherman transmission in reply to Rick '50 8N, 02-07-2000 15:26:25  
Rick, my '50 8N has the Sherman step-up, step-down aux. transmission. With the lever moved closest to the transmission case, forward is low range, back is high range. In between these two positions, the lever will move away from the transmission case about one-half to three-quarters of an inch. With the lever in the "out" position, move it backwards for the standard, regular transmission speeds. (This forward-backward stuff is from memory, I hope I have them right! You can tell how the tractor moves).

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Buck

02-07-2000 16:06:03




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 Re: Sherman transmission in reply to Rick '50 8N, 02-07-2000 15:26:25  

Try this and if it doesn't work go to www.nseries.com and check auxilery transmission



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Dave2n

02-07-2000 15:30:07




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 Re: Sherman transmission in reply to Rick '50 8N, 02-07-2000 15:26:25  
If it's a Sherman "Step-Up" (giving you a high range), and if the lever is on the left side ahead of the clutch pedal, then pulling the lever back gives you high range.



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Rick '50 8N

02-07-2000 15:37:50




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 Re: Re: Sherman transmission in reply to Dave2n, 02-07-2000 15:30:07  
It is on the left ahead of the clutch pedal. Pretty sure it's a Sherman. Just didn't know whether it's a step-up or step-down cause I didn't know which position is engaged and which is "regular". Thanks.



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Dave

02-07-2000 18:43:24




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 Re: Re: Re: Sherman transmission in reply to Rick '50 8N, 02-07-2000 15:37:50  
It's probably both. If it's on the left and dog leg looking lever it might be both. It operates in an "H" pattern. forward is low, back is high. Somewhere inbetween and pulling out and forward (I think) is "standard" drive. I still haven't found the out and forward to get mine into standard drive yet, but I hear/tell it's there.



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Rick '50 8N

02-08-2000 07:24:40




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 Re: Re: Re: Re: Sherman transmission in reply to Dave, 02-07-2000 18:43:24  
It's not both. Visual identification of the handle indicates it's either a step-up or step-down. I'm including a link to the nseries.com page that I'm basing my identification on. It also shows the shift pattern for the over/under tranny as well as the ratios.

(assuming I do this correctly that is....)

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tlak

02-08-2000 04:42:45




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 Re: Re: Re: Re: Sherman transmission in reply to Dave, 02-07-2000 18:43:24  
The n series site aux xmission shows it to be a small backwards h shift pattern.



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